﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;
using System.Diagnostics;

namespace LogReader
{
    public class RelayCommand :ICommand
    {
        readonly Action<object> _execute; 
        readonly Predicate<object> _canExecute;
        
        public RelayCommand(Action<object> execute) : this(execute, null) 
        { 
        }

        public RelayCommand(Action<object> execute, Predicate<object> canExecute) { 
            if (execute == null)            
                throw new ArgumentNullException("execute"); 
            _execute = execute; 
            _canExecute = canExecute; 
        }
        [DebuggerStepThrough]    
        public bool CanExecute(object parameters)    {        
            return _canExecute == null ? true : _canExecute(parameters);    
        }     
        
        public event EventHandler CanExecuteChanged    {        
            add { CommandManager.RequerySuggested += value; }        
            remove { CommandManager.RequerySuggested -= value; }    
        }     
        
        public void Execute(object parameters)    {
            _execute(parameters);    
        }
    }
}
